空心圆柱面积计算，外径22cm，高22cm，内径20cm，求总面积，好像是小学数学题
推荐回答（3个）
内、外径指直径还是半经?
D=22cm，h=22cm，d=20cm.
外表面:S1=πDh;
内表面:S2=πdh;
两个端面圆环面:S3=2[π(D/2)²-π(d/2)²]=π(D²-d²)/2.
∴S=S1+S2+S3
=πDL+πdL+π(D²-d²)/2
=π[DL+dL+(D²-d²)/2]
=3.14×[22×22+20×22+(22²-20²)/2]
=3034.7785033677平方厘米。
上底和下底是两个圆环=22*22π-20*20π=84π
外侧面积=（2*π*22）*22=968π
内侧面积=（2*π*20）*22=880π
表面积=84π+968π+880π=1932π
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